Base coat for metal objects

FIELD: chemistry.

SUBSTANCE: base coat contains chlorine-containing polymer, pigment, plasticiser, organic solvent and rust solvent. The base coat also contains a texturing agent, a dispersing agent and an imidazole derivative. The chlorine-containing polymer used is a vinylchloride copolymer and components are in the following ratio, wt %: vinylchloride copolymer 10-20; plasticiser 3-6; texturing agent 0.2-0.6; dispersing agent 0.2-0.6; pigment 10-25; modifier-rust solvent 5-10; imidazole derivative 0.2-3.0; organic solvent - the rest.

EFFECT: use of the invention allows for depositing a base coat on an unprepared surface in a wide temperature range.

12 cl, 2 tbl

 

The invention relates to chemistry, and in particular to protective coatings of metal products used in oil, gas, energy, chemical and other industries. The coating can be applied on an unprepared surface and operates in a wide temperature range.

Known water-and organic-compounds for priming metal surfaces subject to corrosion. These include, for example, water-soil-rust converters VD-VA-0112 copyright certificate of the USSR No. 329773, 1966 or UNICOR - 1, UNICOR - 2 copyright certificate of the USSR No. 1019842, 1981 halasana compositions can be applied to the surface only at positive temperatures (up to +5°C), have insufficient protective properties and require overlap anticorrosive enamel.

Similar primer on organic basis have a higher protective properties, such as primer EP-0191 (USSR author's certificate No. 1334703, 1992).

Also known primer-modifiers rust-based epoxy resin, pigments, fillers, modifiers, solvents, amine hardener. These include primer according to the author's certificate of the USSR No. 895073 based on epoxy resin, dibutyl phthalate with modifier rust Converter - pyrocatechin, or as the development of the certificate of the USSR No. 1334703 with modifier octadecylsilane salt mechanicalengineer acid.

However, primer based on epoxy resins have two significant drawbacks: not applied at low temperatures (up to +5°C) and prior to application require hardener, that is a two-component coating.

Free from these defects, the formulations based on polymer solutions. An example is that the primer is based on the chlorine-containing polymer (chloroprene rubber), plasticizer, alkylphenolethoxylates resin in an organic solvent, an active filler in the form of magnesium oxide, MDI and modifier mixture of pyridine complexing agents with orthophosphoric acid (patent RF №2011670 - prototype). The advantages of this primer is the possibility of application at low temperatures. However, it cannot be applied on wet or oily surface, i.e. the necessary preliminary preparation of the surface, and also requires the coating in multiple layers due to the small thickness of one layer.

The objective of the proposed solutions is the possibility of priming the unprepared surface in a wide temperature range, including negative, and in one layer by increasing the thickness of the coating.

To solve the problem in the ground-enamel for coating metal articles, which comprises a chlorine-containing polymer, order the tel, pigment, plasticizer, organic solvent and modifier-rust entered structuring additive, a dispersant and a derivative of imidazole, and as a chlorine-containing polymer includes a copolymer of vinyl chloride, in the following ratio, wt.%:

copolymer of vinyl chloride10-20
the plasticizer3-6
structuring additive0,2-0,6
disperser0,2-0,6
pigment10-25
modifier-rust5-10
derivative imidazole0,2-3,0
organic solventrest

Under the unprepared surface refers to the surface without pre-treatment, i.e. containing moisture, rust and oil stains.

To ensure the coating on such surface in the applied composition should contain rust converters and components, crowding out n the surface moisture. Compositions containing such components were specified in the monograph of Grinberga A.S., ICCO AF and Kalinsky T.M. "anti-Corrosion primer. LLC NEPHRONS", St. Petersburg, 2006, s. Description primers applied on oily surfaces in the literature are missing.

The possibility of applying and film forming at low temperatures can be achieved using solutions of polymers in volatile solvents.

To obtain a thick coating in one application, the composition should contain additives that create structural viscosity, reducing the swelling on the surface.

In the primer as the basis for the film forming composition used with a copolymer of vinyl chloride, in particular, vinyl acetate, containing hydroxyl or carboxyl group, and vinyl chloride with a simple vinyl ether.

The composition is prepared as follows. Copolymer of vinyl chloride is mixed with an organic solvent, the solution is added plasticizer, pigments, fillers and dispersed in a ball or bead mills. To facilitate dispersion in the solution add a special substance. When sufficient dispergirovannom pigments and fillers mixing is produced in a high-speed dissolver.

As the solvent use is a mixture of aromatic solvents, acetone and acetates.

To absorb moisture from the surface, in addition to the hydrophilic acetone use of the additive alcohols. To displace moisture from the surface of the added amino compounds components.

To improve the coating adhesion to oily surfaces using imidazole derivatives based on fatty acids AND-5M-6M commonly used for curing epoxy resins.

Quality indicators proposed composition was tested as follows.

To determine the possibility of priming the oily surface of the metal was applied using a spray solution of grease in gasoline, and then dried for 2-3 hours at room temperature. Samblanet samples was determined by weighing samples before applying primer. The value of samblanet should be from 5 to 20 g/m2. On oily within the specified limits, the surface was applied the primer, which were then dried at room temperature. Adhesion primer for oily surface was determined by the method of cross-hatch test.

To determine the ability of the application of the proposed primer at negative temperatures used refrigeration chamber with a temperature of minus 18-20°C. the samples previously subjected to corrosion, then moistened with water and samelevel rastvorosmesitelnoj lubrication. The thus treated samples were placed in the refrigerating chamber.

The primer was applied on the sample surface outside the chamber brush, when this was controlled so that the surface temperature of the samples did not rise above -10°C. After priming the samples were again placed in the refrigerating chamber. After drying, the adhesion was determined by the method of cross-hatch test.

In table 1 examples of implementing the claimed composition.

Table 1
№ name of the component%
Caponier vinyl chloride
- with the hydroxyl-containing vinyl acetate And-15-014
from simple vinyl ether17,811,8--
with vinyl acetate carboxylate the containing to 12.0
2. Plasticizer:
- chloroparaffinthe 5.74,5--
- dioctylphthalate--2,8-
3. Solvent;
- toluene42,029,729,027,0
- acetoneof 5.418,013,313,5
- butyl acetate8,414,615,314,5
- isopropyl alcohol --1,3-
4. Pigment:
- titanium dioxide-1,8-2,1
- pigment red iron oxide--13,3-
- chromium oxide---the 11.6
- carbon technical3,30,9--
- zinc phosphate8,57,4-5,3
5. Filler:talc3,33,42,23,2
6. Dispersant Texaphor YP-3098 0,50,60,50,3
7. Structuring additive:
- Aerosil---1,0
- Panel0,40,5--
- Benton0,5
8. The rust Converter Korrodurthe 5.74,55,55,1
9. The derivative of imidazole AND-6M0,52,72,31,3
Total:100100100100

Table 2 shows the results of determining the effect is elicina samblanet surface properties of the primer composition of example 1.

Table 2.
Samblanet, g/m2Drying time at 20°C up to degree 3, minThe adhesion scoreThe hardness through the day, Rel. Units
5,01010,45
8,21510,40
12,32010,30
18,560The film is soft,the0,08
destroyed when the test

As can be seen from the table, when samblanet to 10-12 g/m2properties primers are slightly changed when the value of samblanet above 18 g/m2due to absorption of oil primer softens.

Thus, the proposed composition is provided which opens the possibility of priming the unprepared surface in a wide range of temperatures, including negative, and by increasing the thickness of one layer.

1. The ground-enamel for coating metal articles containing chlorine-containing polymer, filler, pigment, plasticizer, organic solvent and modifier-rust Converter, characterized in that it further comprises structuring additive, a dispersant and a derivative of imidazole, and as a chlorine-containing polymer includes a copolymer of vinyl chloride in the following ratio, wt.%:

copolymer of vinyl chloride10-20
the plasticizer3-6
structuring additive0,2-0,6
disperser0,2-0,6
pigment10-25
modifier-rust5-10
derived imidazole0,2-3,0
organic solventrest

2. The ground-enamel according to claim 1, characterized in that the plasticizer used chlorine is arafin.

3. The ground-enamel according to claim 1, characterized in that the plasticizer used dioctylphthalate.

4. The ground-enamel according to claim 1, characterized in that the pigment used is titanium dioxide.

5. The ground-enamel according to claim 1, characterized in that the pigment used chromium oxide.

6. The ground-enamel according to claim 1, characterized in that the pigment used carbon technical.

7. The ground-enamel according to claim 1, characterized in that the pigment used zinc phosphate.

8. The ground-enamel according to claim 1, characterized in that it comprises pigment red iron oxide.

9. The ground-enamel according to claim 1, characterized in that the filler used talc.

10. The ground-enamel according to claim 1, characterized in that as a structuring additives used are presented.

11. The ground-enamel according to claim 1, characterized in that as a structuring additives used Panel.

12. The ground-enamel according to claim 1, characterized in that as a rust Converter used Korrodur.



 

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1 tbl

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10 tbl

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EFFECT: improved and valuable properties of compositions.

2 tbl

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